Water-cooled skewback for furnaces.



frans rerun ormoni.-

LUTHER KNOX, 0F BELLEVUE, PENNSYLVANIA, ASSIGNOR TO BLAW-KNOX COMPANY,

OF PITTSBURGH, PENNSYLVANIA, A CORPORATION 0F NEW JERSEY.

WATER-COOLED SKEWBACK FOR PURNACES. i

Application led July 17, 1916. Serial No. 109,651.

To all whom t may concern:

Be it known that I, LUTHER L. KNOX, a

citizen of the'United States, residing at4 Bellevue, in the county of partly broken away,

lskew-backs for water cooled furnaces and is designed to provide a skew-back in which the metallic frame'member may be' readily formed from a single piece of sheet metal, and which will ing the brick or .refractory portionv of the skew-back in place.

Referring rst to that form of vmy invention shown in Fig. 1, the numeral 2 designates a portion of a furnace wall, 3 the supportin frame and 4 the roof arch. l 5 designates t e metallic member of the skew-back for vthe roof arch .4. This member consists of an initially flat plate or sheet of metal of the requisite length of .the particular structure in hand. One edge portionof this structure is bent around upon itself to form -an approximately rectangular` longitudinally extending water circulating cavity 6, the free edge of this bent portion being welded to the body of the plate at the point where the bend starts, The upper edge portion of the plate is preferably flanged backwardly, as shown at 8, in order to form a 'reinfrceand to give, with the lower bentportion, a channel-form to the plate. Nipples 9 can-be welded or otherwise secured to thellwater cooled por-- tions in order to provide -for the connection of 7water circulating pipes 10. The construction. shown in Fig. 2 is similar tothat. shown in Fig. '1 and thesame reference characters have been applied to corresponding parts with the aix a added thereto. Instead, however, of formi-ng the water contalnlng box or chamber ,1n recl Specication of Letters Patent.

provide means for 'retainas indicated at 7.

- metal having a water circulating chamber and an upwardly extending portion which 4approximately the Patented May' 21, 1918.

` tangular form, the sheet or, plate 5a is so bent uponitself as to form a triangular water containing box 'or chamber 6u, thetriangle having its base at the bottom of .the wall 7.l being at the apex.

y 4In bothforms of'my inventionthe bent portion of the plate 'forms a support for the Arefractory portibn 11 or 11@` of the skewback and which forms the actual abutment for the edge of the roof arch.

. The ends of the water circulating box or chamber may be closed in anysuitable'manner as by welding end plates 12. thereto,- Vthese plates being preferably inset as shown 1n Fig. 3.

Myinvention provides a .form of .skewback which can be readily constructed from sheet metal at a relatively low cost and which is greatly superior to cast metal structures, being less liablekto crack or break in service, due to warping, and .contraction and expansion thrusts.` Obviously the particular shape of the metallic member and of the water cooled portion thereof may be changed without departing from the spirit and scope of my invention.

1. A water-cooled skew-back member comprising a sheet metal member, having a portion thereof bent upon itself to form a hollow logigitudinal extending water circulating chamber, the free edge of the bent portion being welded to the body portlon of the sheet at the junction of the body por-- tion of the sheet and the'bent portion, said sheetextending beyond the water circulating chamber to forma support for the refractoryl portion of the skew-back, substantially as described.

2. A skew'back member formed of sheet forms a support for the refractory portion of the skew backabove the water circulating and downwardly, then laterally and then upwardly, the 'ee edge of the upwardly bent portion being secured to the body of the sheet, the upwardly bent portion lying in same plane as the upwardly extending portion; substantially as described.

3. A water-cooled skew-back member for furnaces, comprising a sheet metal member form a reinforcement; substantially as de# 10 having a portion thereof bent upon itself scribed. lto form a hollow longitudinally extending ln testimony whereof, I have hereuntov set vflate circulating hamber, thx free ledge of my hand. "l y 5 t e ent ortion eing secure to t e bod portion olf) the sheet, and said bent portioii LUTHER L extending into and forming a support for Witnesses:

` the refractory portion of the skew-back, said L. H. JOHNSON.,

plate having its upper edge portion bent to H. M. CORWIN. 1 

